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      04-20-2012, 12:48 PM   #17
GTM_Challenge
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Drives: E92 M3,X5M,F30 335
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Quote:
Originally Posted by Mike Lu View Post
Any drone?
We did long term testing with the full and rear only systems. There is no drone at hwy cruising speeds based on feedback from our 3 test cars and different drivers.

The stock exhaust has a slight resonance point in the lower RPMS. You may notice that same spot a bit depending on how sensative you are to resonance.